Whatman™ GD/XP non-sterile depth polypropylene (DpPP) syringe filters The Whatman™ GD/XP non-sterile Polypropylene Depth Filter (dpPP) membrane syringe filters are designed to prepare and enhance the inorganic ion analysis of hard-to-filter samples greater than 10 mL. Each unit contains a prefiltration stack of polypropylene prefilters and dpPP membrane.
